Audio playback device, audio playback method thereof and storage medium

The present application is a U.S. National Phase Entry of International Application No. PCT/CN2023/112176 having an international filing date of Aug. 10, 2023, which claims the priority of the patent application No. 202211057463.2, filed to the CNIPA on Aug. 31, 2022 and entitled “Audio Playback Device, Audio Playback Method Thereof and Storage Medium”. The above-identified applications are hereby incorporated by reference.

Embodiments of the disclosure relates to but is not limited to the technical field of audio, in particular to an audio playback device, an audio playback method thereof and a storage medium.

With its portability and powerful processing power, laptop computer has become an important office tool in daily life. However, in the process of playing music or video with speakers, laptops often produce “sizzling” noises, which affects the user experience.

The following is a summary of subject matters described herein in detail. This summary is not intended to limit the protection scope of claims.

An Embodiment of the Present Disclosure Provides an Audio Playback Method of an Audio Playback Device, Including:

In some exemplary embodiments, before the method, it further includes: determining the scan frequency list; performing one or more single frequency point audio tests on each scan frequency point in the scan frequency point list to determine a first audio gain corresponding to each scan frequency point, the single frequency point audio test includes: playing a single frequency point audio, the single frequency point audio generates a baseband signal and a harmonic band signal, determining a signal gain of the harmonic band signal, and recording the audio gain corresponding to the current single frequency point audio as the first audio gain corresponding to the single frequency point when the signal gain of the harmonic band signal is lower than a preset harmonic gain threshold; and generating an audio resonance table of the audio playback device.

In some exemplary embodiments, the performing of one or more single frequency point audio tests on each scan frequency point in the scan frequency point list includes: initializing the audio gain of the current scan frequency point; outputting a single frequency point audio of the current scan frequency point, wherein the single frequency point audio is propagated through vibration of air and a structural member of the audio playback device to generate a baseband signal and a harmonic band signal; determining the signal gain of the harmonic band signal and determining whether the signal gain of the harmonic band signal is less than or equal to a preset harmonic gain threshold; when the signal gain of the harmonic band signal is less than or equal to the preset harmonic gain threshold, recording the audio gain of the current output single frequency point audio as the first audio gain corresponding to the current scan frequency point; and when the signal gain of the harmonic band signal is greater than the preset harmonic gain threshold, reducing the audio gain of the current single frequency point audio, and returning to the step of outputting the single frequency point audio of the current scan frequency point and continuing to execute in a loop.

In some exemplary embodiments, when reducing the audio gain of the current output single frequency point audio, the audio gain is varied by z dB each time, where z is between −1 and −3.

In some exemplary embodiments, the determining of the scan frequency list includes: determining a lowest scan frequency point located between 20 Hz and 30 Hz, a highest scan frequency point located between 450 Hz and 650 Hz, and a frequency scan step size.

In some exemplary embodiments, the preset harmonic gain threshold is less than-1 dB.

In some exemplary embodiments, the method further includes: acquiring an equalizer data table of the audio playback device; generating a comprehensive signal gain table according to the audio resonance table and the equalizer data table; and processing the audio to be output according to the comprehensive signal gain table.

In some exemplary embodiments, the generating of a comprehensive signal gain table according to the audio resonance table and the equalizer data table includes: generating an initial signal gain table according to the equalizer data table; extracting all first frequency points in the audio resonance table where the first audio gain is less than the maximum audio gain; and inserting all extracted first frequency points whose first audio gain is less than the maximum audio gain and their corresponding first audio gain into the initial signal gain table to obtain the comprehensive signal gain table.

An embodiment of the disclosure further provides an audio playback device, including a memory; and a processor coupled to the memory, the processor is configured to, based on instructions stored in the memory, perform the steps of the audio playback method as described in any embodiment of the present disclosure.

An embodiment of the present disclosure further provides a storage medium on which a computer program is stored, and when the program is executed by the processor, the audio playback method as described in any embodiment of the present disclosure is implemented.

An embodiment of the disclosure further provides an audio playback device including an audio output unit and a process unit, wherein: the process unit is configured for acquiring an audio resonance table of the audio playback device, wherein the audio resonance table includes one or more first frequency points and a first audio gain corresponding to the first frequency points, when the audio playback device outputs audio using the first audio gain at the first frequency point, the signal gain of the generated harmonic band signal is less than or equal to a preset harmonic gain threshold; processing the audio to be output according to the first frequency point and the first audio gain in the audio resonance table; and outputting the processed audio to the audio output unit; and the audio output unit is configured for playing the processed audio.

In some exemplary embodiments, the audio playback device further includes an audio recording unit, wherein: the audio recording unit includes a microphone sensor and a recording process module connected with the microphone sensor, the recording process module is configured for converting an analog signal recorded by the microphone sensor into a digital signal; and the audio output unit includes a speaker.

In some exemplary embodiments, the audio playback device further includes a keyboard, the keyboard includes multiple keys, the multiple keys include at least one first key having an area greater than or equal to a preset area threshold, wherein: there is one or multiple the microphone sensors, and at least one of the microphone sensors is disposed in the area where the first key is located.

Other aspects may be comprehended upon reading and understanding drawings and detailed description.

To make the objectives, technical solutions, and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in detail below with reference to the accompany drawings. Implementation modes may be implemented in multiple different forms. Those of ordinary skills in the art can easily understand such a fact that implementation modes and contents may be transformed into various forms without departing from the purpose and scope of the present disclosure. Therefore, the present disclosure should not be explained as being limited to the contents recorded in the following implementations only. The embodiments and features in the embodiments of the present disclosure may be randomly combined with each other if there is no conflict.

Scales of the drawings in the present disclosure may be used as a reference in actual processes, but are not limited thereto. For example, a width-length ratio of a channel, a thickness and spacing of each film layer, and a width and spacing of each signal line may be adjusted according to actual needs. A quantity of pixels in a display panel and a quantity of sub-pixels in each pixel are not limited to numbers shown in the drawings. The drawings described in the present disclosure are structural schematic diagrams only, and one mode of the present disclosure is not limited to shapes, numerical values, or the like shown in the drawings.

Ordinal numerals “first”, “second”, “third”, etc., in the specification are set not to form limits in numbers but only to avoid confusion between composition elements.

Through actual test and analysis, the “sizzling” noise in the process of playing music or video with speakers in laptop computers is due to the resonance between the keycap of notebook keyboard and the sound emitted by speakers. This resonance frequency band is usually in the low frequency band of 20 Hz˜500 Hz, which may be different for different models. For example, for some models, this resonance frequency band may occur in the low frequency band of 20 Hz˜600 Hz.

By using soft foot pads made of silica gel on speakers, the vibration transmitted by speakers to the keyboard through fixed brackets or adhesive surfaces can be reduced to a certain extent, which is equivalent to suppressing the propagation path of noise vibration. However, the vibration transmitted by speakers to the keyboard has not been fundamentally eliminated, and once some audio output streams with self-gain are appeared, keyboard resonance will still occur, so this way cannot fundamentally reduce the probability of keyboard resonance.

By adjusting the Equalizer (EQ) of the speaker and reducing the low-frequency gain, the low-frequency vibration can also be suppressed. However, this low-frequency suppression method will bring about the problems of weak bass, weak subwoofer output, weak vibration sense and poor user feeling.

As Shown in, an Embodiment of the Present Disclosure Provides an Audio Playback Method for an Audio Playback Device, Including the Following Steps:

According to the first frequency point and the first audio gain in the audio resonance table, the audio playback method of the embodiment of the disclosure processes the audio to be output, which greatly improves the resonance noise of the audio playback device, reduces the rework of the machine, improves the production yield of the production line, improves the quality of the factory, enhances the listening experience of the user when playing the subwoofer audio, and reduces the influence of the low frequency suppression on the bass hearing effect.

In some exemplary embodiments, before the method, the following acts are further included: determining the scan frequency point list; performing one or more single frequency point audio tests on each scan frequency point in the scan frequency point list to determine a first audio gain corresponding to each scan frequency point, herein the single frequency point audio test includes: playing the single frequency point audio, herein the single frequency point audio generates a baseband signal and a harmonic band signal, and determining a signal gain of the harmonic band signal; and generating an audio resonance table of the audio playback device.

In some exemplary embodiments, the generated baseband signal and harmonic band signal may be recorded by an audio recording unit comes with the audio playback device, and Fourier transform (FFT) and harmonic analysis of the baseband signal and harmonic band signal may be performed by a signal process unit comes with the audio playback device to determine a signal gain of the harmonic band signal. In other exemplary embodiments, FFT and harmonic analysis of the generated baseband signal and harmonic band signal may be performed by an external signal processing device to determine the signal gain of the harmonic band signal. In an embodiment of the present disclosure, the signal gain of the harmonic band signal may be expressed in dB values.

In some exemplary embodiments, the performing of one or more single frequency point audio tests on each scan frequency point in the scan frequency point list includes: Initializing the audio gain of the current scan frequency point to the maximum value; outputting a single frequency point audio of the current scan frequency point, wherein the single frequency point audio is propagated through air and vibration of a structural member of the audio playback device to generate a baseband signal and a harmonic band signal; determining the signal gain of the harmonic band signal and determining whether the signal gain of the harmonic band signal is less than or equal to a preset harmonic gain threshold; when the signal gain of the harmonic band signal is less than or equal to the preset harmonic gain threshold, recording the audio gain of the single frequency point audio output by the current audio output unit as the first audio gain corresponding to the current scan frequency point in the audio resonance table; when the signal gain of the harmonic band signal is greater than the preset harmonic gain threshold, reducing the audio gain of the current output single frequency point audio, and returning to the step of outputting the audio of a single frequency point of the current scan frequency point and continuing to execute in a loop.

According to the research of the inventor of the present application, as long as the audio playback device uses the first audio gain to output audio at the first frequency point, the signal gain of the generated harmonic band signal is less than or equal to the preset harmonic gain threshold, then, when the audio playback device uses any audio gain lower than the first audio gain at the first frequency point to output the audio, the signal gain of the generated harmonic band signal will also be less than or equal to the preset harmonic gain threshold. That is, as long as the audio playback device uses the audio gain less than or equal to the first audio gain to output audio at the first frequency point, resonance will not be generated, that is, “sizzling” noise will not be generated.

An embodiment of the present disclosure accurately finds the resonance point of the audio playback device by analyzing the vibration spectrum of each audio playback device, and performing suppressing at the resonance point to obtain an audio resonance table. An exemplary audio resonance table is shown in Table 1.

In some exemplary embodiments, the determining of the scan frequency point list includes: determining a lowest scan frequency point, a highest scan frequency point, and a frequency scan step.

In some exemplary embodiments, the lowest scan frequency point is between 20 Hz and 30 Hz, and the highest scan frequency point is between 450 Hz and 650 Hz.

In some exemplary embodiments, the frequency scan step may be 1 Hz, however, the embodiments of the present disclosure are not limited to this, and the frequency scan step may be other values, for example, 0.5 Hz, but some resonance frequency points may be missed when the frequency scan step is greater than 1 Hz; and when the frequency scan step is less than 1 Hz, the scan time will increase.

Exemplarily, the lowest scan frequency point is 20 Hz, the highest scan frequency point is 500 Hz, and the frequency scan step size is 1 Hz, however, the disclosed embodiments are not limited thereto.

In some exemplary embodiments, the audio gain of the current scan frequency point may be initialized to 0 dB when the audio gain of the current scan frequency point is initialized. In the embodiment of the present disclosure, 0 dB corresponds to the maximum output capability of the audio playback device (i.e., the maximum audio gain, when the audio gain is higher than 0 dB, the audio playback device will produce broken sound or damage). The maximum output capability of different audio playback devices may be different, but it can be assumed that when the audio gain is set to 0 dB, the output is performed using the maximum output capability of the audio playback device.

In some exemplary embodiments, after the step of reducing the audio gain of the current output single frequency audio and before the step of returning the step of outputting the single frequency point audio of the current scan frequency point and continuing a loop execution, the method further includes: detecting whether the audio gain of the current output single frequency point audio is less than or equal to the preset minimum audio gain; when the audio gain of the current output single frequency point audio is greater than the preset lowest audio gain, executing the step of returning to the step of outputting the single frequency point audio of the current scan frequency point and continuing the cyclic execution; and when the audio gain of the current output single frequency point audio is less than or equal to the preset minimum audio gain, exiting the loop. At this time, the first audio gain of the current scan frequency point can be set to a preset lower negative value (e.g. —100 dB). Exemplarily, the preset minimum audio gain may be −60 dB; however, embodiments of the present disclosure are not limited to this and may be −50 dB or −40 dB for example.

In some exemplary embodiments, prior to the step of determining the signal gain of the harmonic band signal, the method may further include: amplifying the generated baseband signal and harmonic band signal, the baseband signal has the same amplification factor as the harmonic band signal. Because of energy loss, when playing single frequency audio, the signal gain of baseband signal and harmonic band signal may be relatively small, so the power amplifier can amplify the baseband signal and harmonic band signal by the same multiple (in actual operation, the sound signal generated through vibration by the output single frequency audio can be converted into real-time analog signal, and the analog signal can be amplified), which can facilitate the subsequent FFT and harmonic analysis.

In some exemplary embodiments, a structural member of an audio playback device includes a keyboard; however embodiments of the present disclosure are not limited thereto. An embodiment of the present disclosure can also eliminate the noise caused by the resonance between the structural member other than the keyboard and the sound emitted by the speaker.

In some exemplary embodiments, a single frequency point audio per scan frequency point may be played for 1 millisecond; however, embodiments of the present disclosure are not limited in this regard.

In some exemplary embodiments, when reducing the audio gain of the current single frequency point audio, the constant change z dB, z<0, may be taken on the basis of the current audio gain each time, or may be dynamically adjusted according to the magnitude of the harmonic gain, the greater the harmonic gain, the greater the reduction.

Exemplarily, z may be between −1 and −3; however, embodiments of the present disclosure are not limited thereto. For example, z can be −3 or −2. For the audio resonance table shown in Table 1, the suppression step z can be −0.01.

In some exemplary embodiments, a preset harmonic gain threshold is less than-1 dB.

Exemplarily, the preset harmonic gain thresholds may be −3 dB or −2 dB or the like; however, embodiments of the present disclosure are not limited thereto. In actual use, the preset harmonic gain threshold can be determined according to the test effect of the actual audio playback device. When the preset harmonic gain threshold value is set to −3 dB, the signal energy of the generated harmonic band signal is less than or equal to half of the signal energy of the generated baseband signal.

In some exemplary embodiments, the first audio gain may be 0 dB or y dB, y<0.

In some exemplary embodiments, the signal gain of the harmonic band signal is determined by performing a Fourier (FFT) transform and harmonic analysis on the baseband signal and the harmonic band signal.is a schematic diagram of time domain signal of a baseband signal and a harmonic band signal according to an exemplary embodiment of the present disclosure.is a schematic diagram of a frequency domain signal of a baseband signal and a harmonic band signal according to an exemplary embodiment of the present disclosure. In, the base frequency point is 50 Hz, and the harmonic frequency points are 100 Hz, 150 Hz, etc.

In some exemplary embodiments, the signal gain of the harmonic band signal includes the signal gain of the first frequency multiplier point to the signal gain of the nth frequency multiplier point, where n is a natural number greater than 1.

In some exemplary embodiments, an audio recording unit in an audio playback device may include a microphone sensor and a recording process module coupled to the microphone sensor, the recording process module is configured to convert an analog signal recorded by the microphone sensor into a digital signal.

In some exemplary embodiments, an audio output unit in an audio playback device may include a speaker.